Phonograph



T. E. PIAZZE Oct. 11, 1932.

PHONOGRAPH Filed Aug. 16, 1929 3 Sheets-Sheet l H l l l l l H Hhl H lH ll l l lfll lll AI miiiimini INVENTOR Thomas E. Pmzze I T ATTORNEYS T. E.PIAZZE Oct. 11, 1932.

PHONOGRAPH Filed Aug. 16, 1929 3 Sheets-Sheet 2 INVENTOR Thomas E. PmzzeATTORNEYS T. E. PIAZZE PHONOGRAPH Filed Aug. 16 1929 3 SheetsSheet 5 2 Qm F 8 m 6 D4. am W m I, IV. I m ma v re A: m; m

INVENTQR Thomas E. P1022:

BY j ATTORNEYS Patented Oct. 11, 1932 UNITED STATES PATENT OFFICE THOMASE. PIAZZE, OF BROOKLYN, NEW YORK, ASSIGNOR TO TECHNIDYNE CORPORA- TION,OF NEW YORK, N. Y., A CORPORATION OF NEW YORK PHONOGRAPH Applicationfiled August 18, 1929. Serial No. 888,247.

This invention relates to phonographs, and more particularly to anautomatic trip for stopping or for initiating the record changing orrecord repeating operations in a phonograph.

The primary object of the present invention is to provide an automatictrip mechanism for phonographs the action of which will not require apreliminary setting to determine the stopping point, and yet which willbe entirely reliable and uniform in its operation.

Phonograph records at the present time" terminate in a variety of ways,some having a terminating groove which is eccentric, others havingconcentric terminating grooves interconnected with the last sound grooveby a :relatively high pitch spiral, while many records have no specialform of terminating groove. One object of the present invention is toprovide an automatic trip the operation of which will be accurately andreliably responsive to any of these various types of rec ords. In thecase of those records having eccentric or spiral terminating groovesthere is an acceleration of the reproducer at the end of the record, andin the case of records without a special terminating groove there is adwell period in which the reproducer assumes a stationary condition. Ineither case there is a change in the reproducer movement at the endofthe record, and in accordance with my invention this change in themotion of the 'reproducer is taken advantage of ,to initiate the desiredoperation of the phonograph trip mechanism.

Only a relatively slight amount of energy is available from the movementof the reproducer in the record grooves, and a further object of myinvention is to make available a moderate or more substantial amount oftrip energy which is merely controlled rather than developed by thechange in movement of the reproducer,.and to this end I utilizemotorenergy, and preferably the rotation of the record turn table during theplaying of the ,record, to store up trip energy, preferably bytensioning a resilient means. The storing or energizing relation betweenthe turn table and the resilient means driven thereby may be initiatedin response to the normal reproducer travel during the playing of therecord, and at the end of the record the .change in the rate ofreproducer movement already described is utilized to release the purposea trip impulse amplifying meanswhich makes it possible to obtain atrigger action of rather considerable force. My invention has as furtherobjects, first, to improve the trip impulse amplifying mean. theredisclosed, and second, to arrange for the effectual combination of suchan amplifying means with the tripping means of in present invention. Tothis end the method of operation of my automatic phonograph triggerincludesstoring upample or sufiicient trigger energy under the influenceof a driving motor, preferably the phonograph driving motor during arecord changing operation, thereafter storing up a moderate amount oftrip impulse energy also under the influence of a driving motor,preferably through the rotation of the record turn table during theplaying of the record, then utilizing a change in the reproducermovement at the end of the record to release the trip impulse energy,and finally utilizing the trip the trap copen ing application, Ser. No.357,444, filed 7 A ril 23,1929.

o the accomplishment of the foregoing and numerous other objects whichwill hereinafter appear my invention consists in the tripping method,the trip mechanism and its elements, and their relation one to theother, as hereinafter are more particularly described in thespecification and sought to be defined in the claims. The specificationis accompanied by drawings in which: I

Fig. 1 is a broken plan view of automatic phonograph mechanism embodyingmy invention;

Fig. 2 is a perspective view of the trigger mechanism;

Figs. 3, 4, 5, and 6 illustrate successive. phases in the operation ofthe automatic trip means;

Fig. 7 is a sectional elevation through the gle breaking and resettinmechanism;

ig. 8 is a plan view 0 an alternative and preferred form of myinvention;

Fig. 9 is a detail of the follower thereof; Fig. 10 is a fragmentarysection taken in the plane of the line 1010 in Fig. 8; and

Fig. 11 is a sectional elevation taken through the toggle breaking andresetting mechanism.

Referring to the drawings, the automatic phonograph trip comprises a.trip means A which is reciprocable, .and which is preferably moved byrotation'of the motor driven record turn table B at a rate commensuratewith the reproducer motion when the latter is traveling in the recordsound grooves. The trip further comprises follower means C which ismoved in direct response to the travel of the reproducer D across therecord. Additional means, preferably in the form of an extension orlever E on trip means A, is provided for disengaging the trip means Afrom the turn table B when the reproducer experiences a change in rateof movement, for such a change is detected by the relative movement ofthe follower C and the lever E, and releases the trip impulse energyreviously stored up by the motor driven turn table B in a resilientmeans F. When trip means A is released the resulting trip impulse may beused directly, or, if desired, may be used to break the toggle of a tripimpulse amplifying means G in order to obtain a still more powerfultrigger movement for operating, for example, a clutch H to initiate arecord changing operation.

Considering the arrangement in Figs. 1 through 7 more in detail, thetrip means A preferably consists of a block 2 formed integrally with asleeve 4 which is freely reci rocable upon a rotatable shaft 6, a ortion0 which is threaded, as at 8. The blocii 2 carries a lever 10 pivotallymounted thereon which is operatively connected with movable teeth 12,preferably by forming the teeth directly on a portion of the lever 10.The teeth 12 are of proper pitch to mate with the thread 8, and thepivot 14 of the lever 10 is so located that when the teeth- 12 engagethe thread 8 they tend .to remain in engagement. However, this tendencyis limited, and the pivot 14 is kept quite close to the thread in orderthat it may be kept very slight so that a very light touch will releasethe teeth 12 from the thread 8. A very li ht spring 16 also tends toturn lever 10 cloc wise, and so to bring the teeth 12 into engagementwith the thread 8.

The turn table B, which has been cut away to illustrate some of themechanism located therebeneath, carries a record 20 provided with soundgrooves beginning with the groove 22 and ending with the groove 24. Theparticular record here shown is terminated with an eccentric terminatinggroove 26 into which the reproducer D rides at the end of the record.The reproducer is carried by an oscillatable reproducer arm 30, mount edon a vertical sleeve 32, which at a level below that of the turn table,carries an arm 34 fitted with a pivoted finger 36, urged to theillustrated out-stretched position by a spring 38, this assemblageconstituting the follower mechanism generally designated C. Finger 36 ispivoted as shown to permit the reproducer to be swung to its outermostposition for beginning a new record, without arm 34 being stopped bystriking block 2.

The arrangement is such that after the reproducer D is brought intomotion by the playing grooves of the record,.an'd preferably only afterthe record has been partially played, say after the passage of-150grooves of a 10inch record, the finger 36 bears against the block 2 andpresses it slightly toward the right. There is but little resistance tomovement at this time because the coil spring F is almost completelyexpanded. Upon a slight movement of block 2 the teeth 12 come oppositethe beginning of the thread 8 and spring 16 brings them into engagement,after which the threaded shaft 6 takes up the movement of block 2 andcontinues moving it in order to store up trip impulse energy bycompressing the coil spring F.

Shaft 6 is power driven, preferably by the regular motor of thephonograph, and in the present case is rotated through the turn tableshaft 40, driven by a motor, not shown in the drawings. Shaft carries aworm 42 meshing with a worm gear 44 which rotates a gear 46 meshing withan intermediate gear 48, the latter rotating a pinion 50 which drives agear 52 on the threaded shaft 6. The gear ratio and the pitch of thethread 8 are so selected that the tripping means A is moved at a ratecoinciding with the normal rate of movement of the follower means C.This feature presents no difficulty because the pitch of the playinggrooves in most of the makes of disc records is standard, being veryclose to 98 threads per inch.

As the record is played there is a change in the rate of transversemovement of the tip of finger 36 relative to the edge of lever 10, owingto the increasing angularity of the follower lever 34, and the trailingedge of lever 10 is therefore properly curved so that the finger 36 willclosely follow it with very little clearance throughout the playing ofthe record.

This is best illustrated in connection with Figs. 3, 4, and 5, referringto which it will be observed that in Fig. 3 finger 36 has just movedblock 2 sufficiently to brin teeth 12 into engagement with thread 8. hemovement of trip means A is thereupon taken up by the thread, as isillustrated in Figs. 4 and 5, and finger 36 follows the trailing edge oflever 10 very closely throughout the playing of the record.

When the reproducer D enters the terminating groove of a record having aspecial terminating groove, such as a spiral of high pitch, or aneccentric groove like the groove 26 shown in Fig. 1, the reproducer isaccelerated and consequently moves the follower means C at a rate fasterthan the movement of trip means A, the latter continuing to move itsnormal amount, proportional to the rotation of the turn table. Finger 36therefore presses against lever 10 and moves it about pivot 14 so as todisengage teeth 12 from thread 8. The action is sensitive, and

almost instantaneously trip means A is reciprocated to the left by thecompressed spring F. The trippin movement of trip means A is nothampered by lever 10, which may pivot as far as necessary to permit itto slide for a portion of its length freely past the end of finger 36,as is illustrated in Fig. 6, which shows trip means A reciprocatedentirely to the left and in contact with bearing 7 of shaft 6.

In this embodiment of my invention the thread 8 is terminated at a pointalong shaft 6 corresponding-to the smallest usual diameter of the soundgrooves in the various makes of records, and at the termination of thethread the shaft is made to again assume its full diameter. Inconsequence of this, when trip means A is carried by the thread andreaches the end thereof without having been tripped by reproduceracceleration in a special terminating groove, the teeth 12 ride out ofthe thread and the stored up trip energy is released. Hence a record notprovided with a special terminating oove is nevertheless automaticallystopp Also, should the reproducer fail to enter the special terminatinggroove of a record the phonograph trip will nevertheless be actuatedafter the passage of a short interval of time.

In general, it is obvious that myform of trip may be made exceedinglysensitive, for but very slight load is placed upon the reroducer forinitiating the trip impulse.

he energy for the trip impulse is in reality supplied b the phonographmotor, and is stored up during the p aying of the record. In order thatthe trip impulse may be uniform re ardless of slight differences in thetravel 0 the trip means A it is referable that the spring F be maderelative y long, so that there is only a slight variation in itscompression when the trip means is released at different points.

In order to strengthen the trip impulse, and to make it perfectlyuniform regardless of the time of trip ing, I may use the trip means sofar descri ed with a trip impulse amplifying means G. This arrangementconsists of a main trigger for actuating clutch H, and a relativelystifl' s ring 62 tending to operate the trigger 60. he sprin 62 isopposed by any suitable barrier, pre erably in the form of a tog leconsisting of a toggle arm 64 pivoted to tie trigger shaft 66, a togglearm 68 pivoted on a fixed ivot 70, an extension 72 of toggle arm 64 orlooking the toggle at slightly beyond dead center, and a bell crankextension 74 on toggle arm 68 arran ed in the path of movement of pin 76on bloc 2 for breakin the toggle in order to release spring 62 ant? soto actuate trigger 60.

The arrangement as here illustrated is applied to the automatic recordchanging phonograph of Lester L. Jones described in the copendingapplications already referred to, the said phonograph employing an(soillatable record turn table for the discharge and loading of records.To this end the turn table mechanism includes and is mounted upon aplate 80 which is journalled in fixed bearings 82, the table beingoscillated about the axis of the bearings 82 by a crank 84 andconnecting rod 86, one end of which is carried on the crank pin of crank84, and the other end of which is anchored in a fixed bearmg.

The trigger energy is stored up under motor drive, and is preferablystored up during the record changing operation.

The manner in which this is done, and the toggle reset, is bestillustrated in connection with Figs. 2 and 7. Referring to Fig. 2 itwill be observed that there is a fixed cam surface 90 which is sopositioned relative to the location of the extension 72 of the toggle inposition.

the parts 0 arm 64 that when the toggle is broken and the turn table istilted the extension 72 bears against cam surface 90 and is resetthereby. In Fig. 6 the pin 76 is shown to have just struck the bellcrank extension 74 on to gle arm 68 and thereby broken the toggle, w doin Fig. 7 extension 72 on toggle arm 64 has come into contact with thecam surface 90. Obviously the radius of the cam surface 90 is diminishedrelative to the position of the toggle extension 72, so that during theoscillation of the turn table. the extension 72 is forced past deadcenter back into contact with fixed pivot the toggle then locking itselfpring 62 has meanwhile been tensioned by the resetting of the toggle.

Fig. 2 also illustrates a fixed cam 92 the function of which will nextbe explained. The automatic phonograph is preferably equipped with reect means or manually operable means for stopping or initiatin a recordchanging operation at any time uring the playlng of a record. In suchcase the turn table may be oscillated and a record changed without tripmeans A having been released to its initial position and, of course,

it will then be tripped at an inopportune time during the playing of thenext record. It is therefore desirable to insure that whenever the turntable is oscillated for the discharge of a record the trip means hereleased, regardless of what caused the oscillation of the turn table,and this is the function of cam 92, the edge 94 of which is so shapedthat when the turn table is oscillated the lever 10 comes in contacttherewith and is thereby moved in the proper direction to disengage theteeth 12 from the thread 8, and thus release spring F and trip means Ato the starting position.

It will also be observed in Fig. 2 that arm 34 is preferabl maderelatively flexible and that the back e ge 35 of finger 36 is preferablysloped as shown in the drawings. This arrangement revents jamming orbreaking of f the mechanism 1n case someone should so interfere with itsautomatic operation as to succeed in having the turn table re-- storedto its playin position while the reproducer arm is hel inwardly insteadof being swung outwardly to the beginning of the record, in which casefinger 36 might be found located inside instead of outside of lever 10.\Vith the arrangement as here shown it then is still possible to swingthe reproducer outi wardly to its initial playing position, for finger36 will oscillate about its pivot and sloping surface 35 will causeflexible arm 34 to yield downwardly as the reproducer arm is swungoutwardly.

The foregoin trip mechanism functions very reliably with any type ofrecord, and functions with extreme sensitiveness for records havingspecial terminating grooves, but has a relatively sluggish response inthe case of records having no special terminating groove. A noticeableand somewhat undesirable period of time elapses before trip means Atravels the full length of thread 8, because to prevent premature triping this thread must be carried along sha 6 to a point corresponding tothe smallest customar diameter of sound oove.

o overcome this di culty I may provide instead of or in addition to themeans so far described for operation with records having no specialterminating groove additional means which operates promptly regardlessof the diameter of the last record groove and which preferably operatesin response to relative movement of the follower means and the tripmeans, just as in the case of records having a special terminatinggroove. When the reproducer enters the last oove of a record having nospecial terminating groove the reproducer dwells or becomes stationary,and in such case the trip means moves relative to the follower meansinstead of the follower means moving relative to the trip means, as isthe case when the reproducer enters a special terminating groove. I somodify the trip mechanism already described that relative movement ofthe follower and the trip means, regardless of which moves faster thanthe other, will operate to disengage the trip means from its drivingmeans an so release the stored up trip impulse energy.

Such an arrangement is illustrated in Fig. 8 of the drawings, referringto which it will be observed that trip means A is in this case providedwith two extensions or arms 10 and 110, and that pin or finger 136 offollower means C is adapted to move between the arms 10 and 110, as at110'. Am 10 is pivoted on a pivot 14 and is urged in a clockwisedirection by a light spring 16, thereby tending to cause engagement ofteeth 12 with thread 8 on drivin shaft 6. Lever 110 is pivoted at 114 ancarries an extending finger 96 which is arranged to bear against afinger 98 on lever 10 so that clockwise movement of lever 110 causescounter clockwise movement of lever 10 and release of trip means A. Therange of motion of lever 110 is defined by stops 100 on block 2.

Lever 134 of follower C carries at its outer extremity a pivoted fingeror extension 135, which after the reproducer has been moved a suitabledistance in playin contact with the record, say 150 grooves o a 10"record, bears against a lower shoulder 102 on block 2 and serves to movethe block slightl to the right. The finger 135 is pivoted as s own topermit the finger to yield slightly during the return movement of thereproducer preparatory to playing a new record. After the preliminarymotion of block 2 the teeth 12 are brought into en agement with thread 8by spring 16 and ereupon the movement of tri means A is taken up byshaft 6.

' eanwhile pin 136 has ocated itself being shaft 6 with tri means A, andthe downward movement 0 arms lO and 110 is arrested b a downwardlyextendin pm 260 fixed to block 2 of trip means A w ich, asis best shownin Fig. 10, rests against the edge 202 of the bed plate 80 of theoscillatable phonograph mechanism. At the time this action first takesplace levers IQ and 110 are relatively widely separated, as 1sillustrated in Fig. 8, but the moment the thread takes up the drive oftrip means A levers 10 and 110 are brought together by the operation ofspring 16 and b the engagement of the teeth with the threa so that thelevers are then positioned closely to the pin in the manner illustratedin Fi 9, lever 10 resting in a recess in pin 136 or a reasonsubsequently to be described.

In operation it will be understood that when the reproducer enters aspecial terml- 3:) nating groove the motion thereof causes pin 136 tomove lever 10 counter clockwise, thereby disengaging teeth 12from-thread 8 and releasing the stored up trip impulse ener On the otherhand, should the record not equipped with a special terminating groove,

when the reproducer enters the last oove thereof it will remainstationary and t e pm 136 will dwell. However, the rotation of the turntable B willcontinue to move trip means A and with it lever 110, and theresulting impulse energy. And

clockwise motion of lever 110 will, throug fingers 96 and 98, move lever10 counter clockwise, and so disengage teeth 12 from thread 8, therebyreleasin the stored up tri nally, if desire thread 8 instead of beingcarried indefinitely may be terminated at a desired minimum, playingradius so that tripping will always be caused at this radius regardlessof whether or not the levers 10 or 110 have been actuated.

The modification illustrated in Figs. 8 through 11 differs from thatillustrated in Figs. 1 through 5 in several other ways which perhaps maybest be described by considering the changes in one relative to theother. In place of the cam 92 in Fig. 2 there is used merely theinconspicuous cam surface 210, best shown in Figs. 9 and 10 of thedrawings. Reflection will show that should the record changingoperations be initiated manually, the movement of lever 10 past camsurface 210 due to the oscillation of the entire turn table mechanismabout the axis of bear- ,13 in g 212 will cause lever 10 to be movedslight- -eter 242. When the ly counter clockwise, and trip mechanism Awill thereby be released.

The trip impulseamphffiigg means G is somewhat similar to that adydescribed except that in this case the extension 72 on the toggle arm 64is used solely to lock the toggle at dead center, and not for resettingpurposes. The toggle arm 68 is formed integrally with a sleeve 214 fixedto a shaft 216 carried in bearings 218. The shaft 216, at theendadjacent the trip means A, carries an upwardly extending pin 220 whichis of suflicient length to be ged by pin 76 on block 2 in order to breakthe toggle. The remote and of shaft 216 carries a downwardly extendingpin 222 which is in alinement with a manually movable plunger 224,movgment of which serves also to break the tog e.

o reset the toggle and to store energy in the to e spring 62 a fixedflat cam 230 is provi e an edge 232 of which is engaged by pin 220 afterthe toggle has been broken and during the resulting oscillation of theturn table mechanism about bearing 212. The movement of pin 220 alongcam edge 232 restores the pin from the position shown in dotted lines mFig. 8 to a vertical position, which at the same time resets the toggleand compresses spring 62.

The embodiment shown in Fi 8 also differs slightly in the spring F, wich is here shown as having a portion of smaller diameter 240, and aportion of larger diamrem'oducer first begins to move trip means A theresistance encountered is only that of portion 242, and is very slightindeed due to the increased diameter of the coils. After the motor drivebegins to take up the movement of trip means A the end of sleeve 4 ofthe trip means bears against the end of sprin portion 240 and thusserves to compress t e portion of the spring which has greaterresistance.

The correct gear ratio and rate of travel of trip means A is hereobtained by the use of on y a single set of gears, consistin of gear 246meshing with gear 252 mounte on shaft 6, gear 246 corresponding to gear46 in the arrangement shown in Fig. 1.

The mode of operation and constructionand the advantages of my automatictrip will for the most part be apparent from the foregoing descriptionthereof. It is obvious that a trip means is provided which is responsiveto any type of record regardless of the form of special terminating oovewhich it has, and regardless of whet r or not it has any specialterminating groove. It also will be apparent that while movement of thereproducer is used to initiate the desired tri impulse, the actual tripimpulse energy is stored up from motor driven means, and if desired, asin the case of a record changing phonograph, this storing up of energymay be in several stages so as to ultimately obtain as powerful and asuniform a trip or trigger im ulse as may be desired.

t will be apparent that while I have shown and described my invention inthe preferred form, many changes and modifications may be made in themethod and structure dis.- closed without departing from the spirit ofthe invention, defined in the following claims.

I claim:

1. An automatic phonograph tri comprising motor driven means to provi etrip energy, and means responsive to a change in the rate ofuni-directional movement of the reproducer at the end of the record torelease the trip energy. a

2. An automatic phonograph trip system comprising a motor, means driventhereby to store u trip energy, means responsive to the repro ucermovement during the playing of a record to initiate the storing up oftrip energy by the motor, and means responsive to a change in themovement of the reproducer to release the stored up trip energy.

3. An automatic phonograph trip comprising means driven by rotation ofthe record turn table to provide trip energy during the, playing of arecord, and means responsive to a change in the movement of thereproducer at the end of the record to release the trip enerah 4.automatic phonograph trigger system comprising a motor, means driventhereby to store up relatively powerful trigger energy, means driven bthe motor to pro- ,vide moderate trip im pu se energy, means responsiveto a change in the movement of the reproducer at the end of the recordto release the trip impulse energy, and means responsive to the tripimpulse to release the trigger ener 5. an automatic phonograph triggersystem comprising a motor, means driven thereby to store uptrigger'energy, means driven by rotation of the'record turntable forprovidin trip impulse energy during the play ing 0 a record, meansresponsive to a change in the movement of the re roducer at the end ofthe record to release t e trip impulse ener and means responsive to thetrip im- P so to release the trigger energy.

6. Trigger mechanism for an automatic record changing phonographcomprising means to store up trigger energy during the recordchangingoperation, means driven by rotation of the record turn table toprovide trip impulse energy during the playing of a record, meansresponsive to a change in the movement of the reproducer at the end ofthe record to release the trip impulse energy, and means responsive tothe trip impulse to release the trigger ener in order to initiate thenext record changing operation.

7. An automatic phono aph trip comprising driven means actuate byrotation of the turn table for provi trip impulse ene follower means moin response to t e travel of the reproducer across the record, and meansfor disengaging the driven means in order to release the trip im ulseenergy when the relative speeds of the 'ven means and the follower meanssubstantially difier.

8. An automatic phonograph trip comprising driven means actuate byrotation of the turn table for providin trip impulse energy, followermeans move in response to the travel of the reproducer across therecord, means for disengaging the driven means in order to release t etrip impulse energy when the relative speeds of the driven means and thefollower means substantially difl'er, as atthe end of a record, andadditional manually operable means for releasing the tri impulse energyat any time during the playing of the record.

9. An automatic phonograph trip comprising driven means actuated byrotation of the turn table for providi trip impulse energy, followermeans move in response to the travel of the reproducer across therecord, and means for disengaging the driven means in order to releasethe trip impulse energy when the speed of the follower means exceedsthat of the driven means.

10. An automatic phonogra h trip comprising driven means actuated yrotation of the turn table for trip impulse energy, follower means movedin response to the travel of the reproducer across the record, and meansfor disengaging the driven means in order to release the trip impulseenergy when the speed of the driven means exceeds that of the followermeans.

11. An automatic phonograph trip comprising reci rocable trip meansmoved by rotation of t e record turn table against resilient meanstending to move the trip means in the opposite direction, follower meansmovin in response to the travel of the reproducer or following the tripmeans during the playing of a record, and means to release the tri meansfrom actuation by the turntable, sai release means being responsive torelative movement of the follower means and trip means so as to releaseth trip means from the turn table in order to obtain the desired tripimpulse from the resilient means when the reproducer rides in the lastgroove in the record.

12. An automatic phonograph trip com prising reciprocable trip meansmoved by rotation of t e record turntable against resilient meanstending to move the trip means in the opposite direction, follower meansmoving in response to the travel of the reproducer for following thetrip means during the playing of a record, and means to release the tripmeans from actuation by the turntable, said release means beingresponsive to relative movement of the follower means and trip means soas to release the trip means from the turntable in order to obtain thedesired trip impulse from the resilient means when the reproducer iseither accelerated or stationary, so as to be responsive to recordshaving various terminating ves.

13. An automatic phonograph trip comprising reciprocable trip means,resilient means tending to move the trip means in one direction, meansdriven by the record. turntable for moving the trip means in theopposite direction against the force of the resillent means, followermeans moving in response to the travel of the reproducer for followinthe trip means during th playing of a recor and means to release thetrip means from the driven means, said release means being responsive torelative movement of the follower means and trip means so as to releasethe trip means from the driven means in order to obtain the desired tripimpulse from the resilient means when the reproducer is accelerated, asby riding in an eccentric or spiral terminating groove in a record.

14. An automatic phonograph trip comprising reciprocable trip means,resilient means tending to move the trip means in one direction, meansdriven by the record turntable for moving the trip means in the oppositedirection, followermeans moving in response to the travel ofthe'reproducer for following the trip means during the playing of arecord, and means to release the trip means from the driven means, saidrelease means being responsive to relative movement of the followermeans andtrip means so as to release the trip means from the drivenmeans in order to obtain the desired trip impulse from the resilientmeans when the reproducer is stationary, as by riding in the last grooveof a record having no s ecial terminating groove.

15. An automatlc phonograph trip comprising reciprocable trip means,resilient means tending to move the trip means in one direction, meansdriven by the record turntable for moving the trip means in the oppositedirection against the force of the resilient means, follower meansmoving in response-to the travel of the reproducer for following thetrip means during the playing of a record, and means to release the tripmeans from the driven means said release means being responsive torelative movement of the follower means and trip means so as to releasethe trip means from the driven means in order to obtain the desired tripimpulse from the resilient means when the reproducer is accelerated, asby riding in an eccentric or spiral terminating groove in a record, orwhen the reproducer is stationary, as by riding in the last groove of arecord having no special tenninating groove.

16. An. automatic phonograph trip comprising reciprocable trip means,resilient means tending to move the trip means in one direction, meansdriven by the record turntable for moving the trip means in the oppositedirection against the force of the resilient means, and means forreleasing the trip means from the driven means at a point correspondingto the smallest customary sound groove diameter, in order to obtain thedesired trip impulse from the resilient means.

17. An automatic phonograph trip comprising reciprocable trip means,resilient means tending to move the trip means in one direction, meansdriven by the record turntable for moving the trip means in the oppositedirection against the force of the resilient means, follower meansmoving in response to the travel of the reproducer for following thetrip means during the playing of a record, and means to release the tripmeans from the driven means, said release means being responsive torelative movement of the follower means and trip means so as to releasethe trip means from the driven means when the reproducer rides in aneccentric or spiral terminating groove in the record, and means forreleasing the trip means from the driving means at a point correspondingto the smallest customary sound groove diameter, in order to obtain thedesired trip impulse, whether or not the record has a specialterminating groove.

18. An automatic phonograph trip comprising reciprocable trip means,resilient means tending to move the trip means in one direction, meansdriven by the record turntable for moving the trip means in the oppositedirection, follower means moving in response to the travel of thereproducer for following the trip means during the playing of a record,and means to release the trip means from the driven means, said releasemeans being responsive to relative'movement of the follower means andtrip means so as to release the trip means from the driven means whenthe reproduceris either accelerated or stationary, and means forreleasing the trip means from the driving means at a point correspondingto the smallest customary sound groove diameter, in order to obtain thedesired trip impulse, whether or not the record has a specialterminating groove.

19. An automatic phonograph trip comprising reciprocable trip means carring a pivoted lever operatively connected with movable teeth, a threadedshaft driven by the record turntable for moving the trip means when theteeth are engaged in the thread, rcsilient means for moving the tripmeans in the opposite direction when the teeth are disengaged from thethread, follower means moving adjacent the lever in response to thetravel of the reproducer, whereby dwell of the follower caused by thereproducer reaching the last groove of a record moves the lever anddisen gas the teeth a... the thread, in order to o tain a trip impulse.

20. An automatic phonograph tnp comprisingl reciprocable trip means carg a pivote lever operatively connecte with movable teeth, a t readedshaft driven by the record turntable for moving the trip means, when theteeth are engaged in the thread, against resilient means tendin to movethe trip means in the opposite irection, follower means moving ad] acentthe lever 1n response to the travel of the reproducer wherebyacceleration of the follower caused by the reproducer reaching aneccentric or spiral terminating groove moves the lever and disengagesthe teeth from the thread, in order to obtain a trip impulse.

21. An automatic phonograph trip comprising reciprocable tri meanscarrying a pivoted lever operative y connected with movable teeth athreaded shaft driven by the record turntable for movin the trip meanswhen the teeth are engagedm the thread, resilient means for moving thetri means in the opposite direction in order to o tain a trip impulsewhen the teeth are disengaged from the thread, follower means movingad'acent the lever in response to the travel of t e reproducer, wherebacceleration of the follower caused hy t e reproducer reaching aneccentric or s iral tenmnating groove moves the lever an disengages theteeth from the thread, said thread terminating at a point corrrespondinto the smallest customary sound groove diameter, so that the teeth aredisengaged from the thread even if the record has no/special terminatinggroove.

22. An automatic phonograph trip comprising reciprocable trip meanscarrying an extension operatively connected with movable teeth, athreaded shaft driven by the record turntable for movin the tri meanswhen the teeth are engage in the t read, resilient means for movingthetrip means in the opposite direction when the teeth are disengaged fromthe thread, and follower means moving along with the extension inresponse to the travel of the reproducer, said follower means andextension being so operatively related that relative movement in eitherdirection of the follower and the extension disengages in the teeth fromthe thread, in order to obtain a trip impulse at the end of any type ofrecord. v t

23. An automatic phonograph trip comprising reciprocable trip meanscarrying an extension operatively connected with movable teeth, athreaded shaft driven by the record turntable for moving the trip meanswhen the teeth are engaged in the thread, resilient means for moving thetrip means in the opposite direction when the teeth are disengaged fromthe thread in order to obtain a trip impulse, follower means movingalong with the extension in response to the travel of the reproducer,said follower means and ex tension being so operatively related thatrelative movement in either direction of the follower and the extension,as at the end of a record, disengages the teeth from the thread,

and additional manually o rable means for disengaging the teeth and tread at any time during the playing the record.

24. An automatic phonograph trip comprising reciprocable trip meanscarrying a space pair of pivoted levers operative y connected withmovable teeth, a threaded shaft driven by the record turntable formoving the trip means when the teeth are engaged in the thread,resilient means for moving the trip means in the opposite direction whenthe teeth are disengaged from the thread, follower means moving betweenthe levers in response to the travel of the reproducer, wherebyacceleration of the follower, as by the reproducer reaching an eccentricor spiral terminating groove, moves one of the levers and disen ges theteeth thereon from the thread, and well of the follower, as by thereproducer reaching the last groove of a record having no specialterminating groove, moves the other lever and disengages the teeth fromthe thread, in order to obtain a trip impulse at the end of any type ofrecord.

25. An automatic phonograph tri ger comprising reciprocable trip means,resi ient means tending to move the trip means in one direction, meansdriven by the record turntable for moving the trip means in the oppositedirection against the force of the resilient means, follower meansmoving in response to the travel of the reproducer for following thetrip means during the laying of a record, and means to release t e tripmeans from the driven means, said release means being responsiye torelative movement of the follower means and trip means so as to releasethe trip means from the driven means in order to obtain a trip impulsewhen the reproducer rides in the terminating groove of a record, and triimpulse amplifying means comprlsing a trigger, resilient means tendingto actuate the trigger, and means responsive to movement of the tripmeans for permitting the resilient means to actuate the trigger.

26. An automatic phonograph trigger comprising reciprocable trip means,resilient means tending to move the trip means in one direction, meansdriven by the record turntable for moving the trip means in the oppositedirection, follower means moving in response to the travel of thereproducer for following the trip means during the playing of a record,and means to release the trip means fromthe driven means said releasemeans being responsive to relative movement of the follower meansandtrip means so as to release the trip means from the driven means inorder to obtain a trip impulse in response to relative movement ineither direction caused when the reproducer either accelerates ordwells, and trlp impulse amplifying means comprising a trigger,resilient means tending to actuate the trigger, a barrier preventingactuation of the trigger, and means responsive to movement of the tripmeans for releasing the barrier and permitting actuation of the trigger.

27. An automatic phonograph trigger comprising reciprocable trip means,relatively light resilient means tending to move the trip means in onedirection, means driven by the record turntable for moving the tripmeans in the opposite direction, follower means moving in response tothe travel of the reproducer for following the trip means during theplaying of a record, and means to release the trip means from the drivenmeans said release means being responsive to relative movement of thefollower means and trip means so as to release the-trip means from thedriven means in order to obtain a trip impulse when the reproducer ridesin the terminating groove of a record, and trip impulse amplifying meanscomprising a trigger, relatively heavy resilient means tending toactuate the trigger, a toggle barrier preventing actuation of thetrigger, and means responsive to movement of the trip means for breakingthe toggle and permitting actuation of the trigger.

28. An automatic record changing phonograph trig er comprisingreciprocable trip means, resi ient means tending to move the trip meansin one direction, means driven by the record turn table for moving thetrip means in the opposite direction, follower means moved in responseto the travel of the reproducer for following the trip means during theplaying of the record, and means to release the trip means from thedriven means, said release means being responsive to relative movementof the follower means and trip means so as to release thetrip means fromthe driven means in order to obtain a trip impulse when the reproducerrides in the terminating groove of a record, and trip impulse amplifyingmeans comprising a trigger, resilient means tending to actuate thetrigger, a toggle barrier preventing actuation of the trigger, meansresponsive to movement of the trip means for breaking the toggle andpermitting actuation of the trigger in order to initiate a recordchanging operation, and additional means responsive to the recordchanging operation for resetting the toggle.

29. An automatic phonograph trigger system comprising a motor, meansdriven thereby to store up trigger energy, means respon- "sive to achange in the rate of uni-directional movement of the reproducer at theend of the record to release the trigger energy, and

manually operable means to release the trig- V ger energy at any timeduring the playing of the record.

30. An automatic phonograph trigger system comprising a motor, meansdriven thereby to store up trigger energy, means driven thereby forproviding trip impulse energy, means responsive to a change in themovement of the reproducer at the end of the record to release the tripimpulse energy, means responsive to the tri impulse to release thetrigger energy, and manually operable means to release the triggerenergy at any time during the playing of the record.

Signed at New York in the county of New York and State of New York this13th day of August A. D. 1929.

THOMAS E. PIAZZE.

